Chapter 5 85
Power Connectors
The ATX 24-pin power connector (JPWR1) allows you to connect an ATX 24-pin or ATX 20-pin power supply.
When using a 20-pin ATX power supply, plug the power supply along with pins 1 and 13. A foolproof design is
on pins 11, 12, 23, and 24 to avoid wrong installation.
The ATX 12V power connector (JPWR2) provides power to the processor.
Important notification about power issue
The NForce chipset is very sensitive to ESD (Electrostatic Discharge), therefore this issue mostly happens
while the users intensively swap memory modules under S5 (power-off) states, and the power cord is plugged
while installing modules. Due to several pins are very sensitive to ESD, so this kind of memory-replacement
actions might cause system chipset unable to boot.
Please follow the following solution to avoid this situation.
1. Unplug the AC power cable.
2. Unplug the ATX 24-pin and ATX 12V power connectors before the first installation or during system
upgrade procedure.
Pin Signal Pin Signal
1 +3.3V 13 +3.3V
2 +3.3V 14 -12V
3GND 15GND
4 +5V 16 PS-ON#
5GND 17GND
6 +5V 18 GND
7GND 19GND
8PWR OK 20Res
9 5VSB 21 +5V
10 +12V 22 +5V
11 +12V 23 +5V
12 +3.3V 24 GND
Pin Signal Pin Signal
1GND 5+12V
2GND 6+12V
3GND 7+12V
4GND 8+12V
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